WO2010112404A1 - Multi-touch optical touch panel - Google Patents

Multi-touch optical touch panel Download PDF

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Publication number
WO2010112404A1
WO2010112404A1 PCT/EP2010/053938 EP2010053938W WO2010112404A1 WO 2010112404 A1 WO2010112404 A1 WO 2010112404A1 EP 2010053938 W EP2010053938 W EP 2010053938W WO 2010112404 A1 WO2010112404 A1 WO 2010112404A1
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WO
WIPO (PCT)
Prior art keywords
light
emitting element
detecting surface
receiving
receiving element
Prior art date
Application number
PCT/EP2010/053938
Other languages
English (en)
French (fr)
Inventor
Hawaii Xuan
Ducy Chang
Edward Lee
Robert David Parsons
Original Assignee
International Business Machines Corporation
Ibm United Kingdom Limited
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by International Business Machines Corporation, Ibm United Kingdom Limited filed Critical International Business Machines Corporation
Priority to US13/257,802 priority Critical patent/US8878818B2/en
Priority to JP2012502589A priority patent/JP5593375B2/ja
Priority to CN201080002790.7A priority patent/CN102203707B/zh
Priority to CA2743108A priority patent/CA2743108C/en
Priority to EP10711657.6A priority patent/EP2414922B1/en
Publication of WO2010112404A1 publication Critical patent/WO2010112404A1/en

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Classifications

    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
    • G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
    • G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
    • G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
    • G06F3/042—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by opto-electronic means
    • G06F3/0421—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by opto-electronic means by interrupting or reflecting a light beam, e.g. optical touch-screen
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F2203/00—Indexing scheme relating to G06F3/00 - G06F3/048
    • G06F2203/048—Indexing scheme relating to G06F3/048
    • G06F2203/04808—Several contacts: gestures triggering a specific function, e.g. scrolling, zooming, right-click, when the user establishes several contacts with the surface simultaneously; e.g. using several fingers or a combination of fingers and pen

Definitions

  • optical touch panel and, more particularly, to a multi-point optical (e.g. infrared) touch panel.
  • multi-point optical e.g. infrared
  • touch panel technologies are presently in existence, including resistive technology, capacitive technology, surface acoustical wave (SAW) technology, infrared (IR) technology, etc. Comparing with other touch panel technologies, the IR technology has lots of advantages, for example, better durability, reliability, sealability, and no calibration required etc.
  • IR touch panel technology infrared emitter/collector pairs are used to project an invisible grid of light a small distance over the surface of the panel.
  • touch coordinates e.g., X/Y rectangular coordinates. Since the method of determining a touch is optical instead of electrical or mechanical, IR touch panels are not as sensitive to damage as some technologies, such as resistive and capacitive technologies.
  • Fig. 1 shown in the US patent depicts the construction of a conventional optical touch panel.
  • the optical touch panel comprises a plurality of light- emitting elements (e.g., LEDs) arranged along two adjacent sides of a rectangular position-detecting surface and a plurality of light-receiving elements (e.g., photo transistors) 130 arranged along the other two sides of the rectangular position-detecting surface such that the light-emitting elements 1 10 are positioned opposite to the respective light-receiving elements and the position-detecting surface is positioned between the light-emitting elements and the light-receiving elements.
  • LEDs light- emitting elements
  • a plurality of light-receiving elements 130 arranged along the other two sides of the rectangular position-detecting surface such that the light-emitting elements 1 10 are positioned opposite to the respective light-receiving elements and the position-detecting surface is positioned between the light-emitting elements and the light-receiving elements.
  • the light-emitting elements and the light-receiving elements must be arranged along the four sides of the position-detecting surface, and hence it takes a significant amount of time to establish wire connections among the elements.
  • the optical touch panel is complicated, its assembly difficult, and it is difficult to reduce its size.
  • Taiwan Patent Application No. 96151662 Another construction of a conventional optical touch panel is disclosed in Taiwan Patent Application No. 96151662, which is incorporated herein by reference.
  • the optical touch panel 101 may comprise a rectangular position-detecting surface 150 with a specified length L and a specified width W (wherein L may be greater than or equal to W), a plurality of light-emitting element pairs (1 10a, 1 10b), two reflectors (e.g., mirrors) 120, and a plurality of light-receiving element pairs (130a, 130b).
  • Each light-receiving element may be configured for receiving light beams reflected by the reflectors 120 or light beams directly emitted by the plurality of light-emitting element pairs without reflection.
  • the plurality of light- emitting element pairs (1 10a, 1 10b) may comprise light emitting diodes (LEDs).
  • the plurality of light-receiving element pairs (130a, 130b) may comprise photo transistors.
  • the plurality of light-emitting element pairs (110a, 110b) may be arranged in pair at various points along a first side 110 of the rectangular position-detecting surface 150 in a lengthwise
  • (L) direction More specifically, there may be various points (e.g., point 0, point 1 ... point L) along the first side 110 at which the plurality of light-emitting element pairs (310a, 310b) may be arranged. At each of these various points, other than the starting and the ending points (i.e., point 0 and point L, which are at the edges of the first side 110), a first light- emitting element (HOa) and a second light-emitting element (HOb) may be arranged in pair
  • a second light-emitting element (HOb) may be arranged, while at the ending point (i.e., point L), a first light-emitting element (110a) may be arranged].
  • the first light-emitting element (HOa) may be arranged at the left side of each light-emitting element pair (110a, 110b) at an angle 180- ⁇ with reference to the first side 110, and the second light-emitting element (HOb) may be arranged at the right side of each light-emitting element pair (110a, 110b) at an angle ⁇ with reference to the first side 110.
  • the angle ⁇ with reference to the first side 310 may be greater than an angle ⁇ , which may be the angle of the diagonal line of the rectangular position-detecting surface 150 with reference to the x-axis of the rectangular position-detecting surface 150.
  • the angle ⁇ may be 45 degrees, in which case the angle between the first light-emitting element (HOa) and the second light-emitting element (H Ob) of each light-emitting element pair
  • the plurality of light-receiving element pairs (130a, 130b) may be arranged in pair at various points along a second side 130 opposite to the first side 1 10 of the rectangular position-detecting surface 150 in the lengthwise (L) direction. More specifically, there may be various points (e.g., point 0, point 1 ... point L) along the second side 130 at which the plurality of light-receiving element pairs (130a, 130b) may be arranged.
  • a first light-receiving element (130a) and a second light-receiving element (130b) may be arranged in pair [note that at the starting point (i.e., point 0), a second light- receiving element (130b) may be arranged, while at the ending point (i.e., point L), a first light-receiving element (130a) may be arranged].
  • the first light-receiving element (130a) may be arranged at the left side of each light-receiving element pair (130a, 130b) at an angle ⁇ -180 with reference to second side 130, and the second light- receiving element (130b) may be arranged at the right side of each light-receiving element pair (130a, 130b) at an angle - ⁇ with reference to the second side 130.
  • the angle ⁇ with reference to the second side 130 may be greater than the angle ⁇ .
  • the angle ⁇ may be 45 degrees, in which case the angle between the first light-receiving element (130a) and the second light-receiving element (130b) of each light-receiving element pair (130a, 130b) is 90 degrees.
  • the two reflectors 120 may be arranged along two opposing sides of the rectangular position-detecting surface 150 in a widthwise (W) direction for reflecting light beams emitted by the plurality of light-emitting element pairs (110a, 110b).
  • each of the second light-receiving elements (130b) at points 0 through 4 may receive light beams emitted from the first light-emitting elements (HOa) at points 19 through 23 respectively.
  • each of the first light-receiving elements (130a) at points 19 through 23 may receive light beams emitted from the second light- emitting elements (HOb) at points 0 through 4 respectively. It is important to note that such transmissions of light beams are not explicitly illustrated in Fig. IA but nevertheless are possible with respect to the optical touch panel 101 as depicted in Fig. IA.
  • a control circuit (not shown) may be configured for causing the light-emitting element pairs
  • the control circuit may be configured for causing the plurality of light-receiving element pairs (130a, 130b) to receive the light beams emitted from the plurality of light- emitting element pairs (110a, 110b). Accordingly, optical paths may be formed on the position-detecting surface 150 in a grid pattern as shown in Fig. IA.
  • the object M blocks a light beam 140 emitted by one of the first light-emitting elements (1 10a) and reflected by one of the reflectors 120. Moreover, the object M blocks a light beam 142 directly emitted by another of the first light-emitting elements (H Oa). Due to the blockage of the light beam 140 and the light beam 142, two of the light-receiving elements do not receive these light beams.
  • an object Mo e.g., a pointing device such as a touch pin or a finger
  • the two light-receiving elements that do not receive the light beams may be located at two points that respectively may be a distance 'm' and 'n' away from the left edge (i.e., point 0) of the second side 130 of the rectangular position-detecting surface 150.
  • one of the two light-receiving elements not receiving a light beam may be "at a left portion" of the second side 330 and accordingly may be positioned at the point that is 'm' away from the left edge, while the other of the two light-receiving elements not receiving a light beam may be "at a right portion" of the second side 330 and accordingly may be positioned at the point that is 'n' away from the left edge.
  • the two light-emitting elements that correspond to the two light-receiving elements may be located at two points that respectively may be a distance 'x' and 'y' away from the left edge (i.e., point 0) of the first side 1 10 of the rectangular position-detecting surface 150.
  • control circuit may be configured to determine the X/Y rectangular coordinates (A, B) of the object Mo based on which light-receiving elements fail to receive a light beam during a scan cycle due to blockage of the light beam 140 and the light beam 142.
  • the coordinates of the intended center position of the object Mo may be determined by averaging the detected coordinate information. Such averaging may be completed by the control circuit or by another device operatively coupled to the optical touch panel 101.
  • the control circuit may be configured for dividing the position- detecting surface 150 into four regions I, II, III, and IV. These four regions I, II, III, and IV may be based on whether each of the two light-receiving elements not receiving a light beam is a first light-receiving element 130a or a second light-receiving element 130b of one of the plurality of light-receiving element pairs (130a, 130b).
  • the problem for the optical touch panel 101 mentioned above will be only single point detected.
  • the control circuit cannot determine the actual X/Y rectangular coordinates of points M 2 and M 4 .
  • the points M 2 and M 4 block four light beams, respectively as light beam 140, 142, 144 and 146.
  • there will be six potential points i.e. Mo, Mi 1 M 2 , M 3 , M 4 , M 5 ) being obtained via the computation of the equations mentioned above based on the blocked light beam 140, 142, 144 and 146. Therefore, there exist potential combinations of other two points that block the same four light beams, e.g.
  • the control circuit cannot determine the actual X/Y rectangular coordinates of points M 2 and M 4 based on which light-receiving elements fail to receive a light beam during a scan cycle due to blockage of the light beams, such as the light beams 140, 142, 144, 146.
  • These points except points M 2 and M 4 are not actual points and thus are defined as phantom points.
  • the multi-touch optical touch panel which comprises a position-detecting surface with a specified length and a specified width.
  • the multi-touch optical touch panel may comprise a first set of plurality of light-emitting element pairs configured for emitting a plurality of light beams, wherein the first set of plurality of light-emitting element pairs are arranged in pair at various points along a first side of the position- detecting surface in a lengthwise direction.
  • a first light-emitting element may be arranged at the left side of each light-emitting element pair at an angle 180- ⁇ i with reference to the first side, and a second light-emitting element may be arranged at the right side of each light-emitting element pair at an angle G 1 with reference to the first side.
  • a second set of plurality of light- emitting elements may be arranged at said various points along the first side at 90 degrees with reference to the first side.
  • the optical touch panel may comprise two reflectors (e.g. mirrors) arranged along two opposed sides of the position-detecting surface in the widthwise direction, wherein the reflectors are configured for reflecting the plurality of light beams emitted by the first set of plurality of light-emitting element pairs.
  • the optical touch panel may comprise a first set of plurality of light- receiving element pairs configured for receiving the plurality of light beams emitted by the first set of plurality of light-emitting element pairs, wherein the first set of plurality of light-receiving element pairs are arranged in pair at various points along a second side of the position- detecting surface opposite to the first side in a lengthwise direction.
  • a first light-receiving element is arranged at the left side of each light-receiving element pair at an angle ⁇ i-180 with reference to the second side, and a second light-receiving element is arranged at the right side of each light-receiving element pair at an angle -G 1 with reference to the second side.
  • a second set of plurality of light-receiving elements are arranged at said various points along the second side at -90 degrees with reference to the second side for receiving the plurality of light beams emitted by the second set of plurality of light-emitting elements.
  • the optical touch panel may comprise a control circuit which is configured for causing the first set of plurality of light-emitting element pairs and the second set of plurality of light-emitting elements to emit the plurality of light beams in a predetermined order to scan the position-detecting surface, and further configured for causing the first set of plurality of light-receiving element pairs and the second set of plurality of light-receiving elements to receive the plurality of light beams, thereby forming optical paths on the position-detecting surface in a grid pattern.
  • the multi-touch optical touch panel is adapted for detecting objects positioned on the position-detecting surface, and wherein at least a portion of the plurality of light beams are blocked by the objects when the objects are positioned on the position-detecting surface, thereby hindering the portion of the plurality of light beams from reaching one of the second set of plurality of light-receiving elements and at least one of the first or second light-receiving elements of at least one of the first set of plurality of light-receiving element pairs.
  • Another aspect of the present invention discloses a method of determining actual coordinates of objects positioned on a position-detecting surface of a multi-touch optical touch panel, comprising: detecting, for angle ⁇ i, all light-receiving elements that do not receive light beams during a scan cycle due to the blockage of the light beams by objects and the distances of the light-receiving elements away from the left edge of the rectangular position-detecting surface; obtaining all potential combinations by selecting any two of all light-receiving elements that do not receive the light beams in order to determine all potential positions of objects, and separately computing touch coordinates of all potential positions of objects to create a set of the coordinates of objects; repeating the previous steps for next ⁇ i; and retrieving an intersection from all sets of coordinates of all potential positions of objects created for different angle ⁇ i in order to obtain the actual coordinates of objects, after all computations for all ⁇ i are finished.
  • Still another aspect of the present invention discloses a method of arranging a first set and a third set of plurality of light-emitting element pairs and a second set of plurality of light-emitting elements on a frame-shaped circuit board that surrounds the perimeter of a position-detecting surface, comprising: arranging the first set of plurality of light-emitting element pairs on a first surface of the frame-shaped circuit board in pair at various points along a first side of the position-detecting surface in a lengthwise direction, in which a first light-emitting element is arranged at the left side of each of the first set of light-emitting element pairs at an angle 180- ⁇ i with reference to a first side, and a second light-emitting element is arranged at the right side of each of the first set of light-emitting element pairs at an angle G 1 with reference to the first side; arranging the third set of plurality of light-emitting element pairs on a second surface of the frame-shaped circuit board in pair at various points along the first side of the
  • Fig. 1 is a schematic diagram of the construction of an optical touch panel 101 shown in the Taiwan patent application No. 96151662 (and counterpart US patent application US 2009/0167724;
  • Fig. IB is a schematic diagram of the construction of a multi-touch optical touch panel formed by improving that of Fig. IA to provide the detection of two-point touch;
  • Fig. 2A and Fig.2B are a schematic diagram of the construction of a multi-touch optical touch panel solving the problem of Fig. IB;
  • Fig. 3 is a schematic diagram of arranging the added plurality of light-emitting element pairs (210c, 21Od) and the corresponding plurality of light-receiving element pairs (230c, 23Od) for the construction of a multi-touch optical touch panel provided for detecting four-point touch according to one embodiment of the present invention.
  • Fig.4 is a top view of arranging the plurality of light-emitting element pairs (210a, 210b) according to the construction of a multi-touch optical touch panel provided for detecting four-point touch of the present invention
  • Fig. 5 is a bottom view of the plurality of light-emitting element pairs (210c, 21Od, 21Oe) according to the construction of a multi-touch optical touch panel provided for detecting four-point touch of the present invention
  • Fig. 6 is a side view of the multi-touch optical touch panel according to the construction of a multi-touch optical touch panel provided for detecting four-point touch of the present invention.
  • Fig. 7 is a flowchart of determining actual coordinates of objects or touches positioned on a position-detecting surface of a multi-touch optical touch panel provided for detecting four-point touch.
  • FIG. IB a schematic diagram of the construction of a multi- touch optical touch panel formed by improving that of Fig. IA to provide the detection of two-point touch is provided.
  • the plurality of light-emitting element pairs (110a, 110b) and the plurality of light-receiving element pairs (130a, 130b) that may be respectively arranged in pair, as shown in Fig. IA, at the various points (e.g., point 0, point 1 ... point L) along the first side 110 of the rectangular position-detecting surface 150 in a lengthwise (L) direction and the various points (e.g., point 0, point 1 ...
  • a plurality of light-emitting elements HOc and a plurality of light-receiving elements 130c may be further arranged respectively at the first side 1 10 and the second side 130.
  • the plurality of light-emitting elements HOc may be arranged at the various points (e.g., point 0, point 1 ... point L) along the first side 110 at an angle 90 with reference to the first side 1 10, while the plurality of light-receiving elements 130c may be arranged at the various points (e.g., point 0, point 1 ... point L) along the second side 130 at an angle (-90) with reference to the second side 130.
  • each of the six points (Mo, Mi 1 M 2 , M 3 , M 4 , M 5 ) shown in Fig. IA has three light beams passing through during a scan cycle. If a user simultaneously touches two points, M 2 and M 4 , on the position-detecting surface 150, as the aforementioned case, there will be other combinations of two points selected from the six points(i.e.
  • Mo, Mi, M 2 , M 3 , M 4 , M5) that block the same four light beams, respectively as light beam 140, 142, 144 and 146, for example, points (Mi and M5) or (Mo and M3) mentioned above, but only light-receiving elements 130c positioned at point 5 and point 6 fail to receive a light beam during a scan cycle due to blockage of the light beams only emitted by the light-emitting elements HOc positioned at point 5 and point 6.
  • control circuit may be configured to determine the actual X/Y rectangular coordinates (A, B) of the objects M2 and M 4 further based on which light-receiving elements 130c fail to receive a light beam during a scan cycle due to blockage of the light beams emitted by the light-emitting elements HOc.
  • the present invention may be broadened to determine the actual coordinates of (n- 1) objects that simultaneously touch (n- 1) points if each point on the position-detecting surface 150 has (n) light beams passing through during a scan cycle.
  • a control circuit may be configured for causing the light-emitting elements (110a, 110b, 1 10c) to emit light beams in a predetermined order for the purpose of scanning the position-detecting surface 150, and also causing the light- receiving elements (130a, 130b, 130c) positioned opposite to the respective light- emitting elements to receive the light beams emitted from the light-emitting element pairs (110a, 110b, 130c). Accordingly, optical paths may be formed on the position-detecting surface 150 in a grid pattern to determine the X/Y rectangular coordinates of the two touch points.
  • the plurality of light-emitting element pairs may be arranged in pair at various points (e.g., point 0, point 1 ... point 14) along a first side respectively at an angle (180- ⁇ i) and an angle G 1 with reference to the first side of the rectangular position-detecting surface 250 in a lengthwise (L) direction, while the plurality of light-emitting elements 21Oe may be arranged at various points (e.g., point 0, point 1 ... point 14) along the first side at an angle ⁇ 3 (i.e.
  • the plurality of light-receiving element pairs (230a, 230b) may be arranged in pair at various points (e.g., point 0, point 1 ... point 14) along a second side opposite to the first side respectively at an angle ( ⁇ i-180) and an angle (- ⁇ i) with reference to the second side of the rectangular position-detecting surface 250 in a lengthwise (L) direction, while the plurality of light-receiving elements 23Oe may be arranged at various points (e.g., point 0, point 1 ... point 14) along the second side at an angle - ⁇ 3 (i.e. -90 degrees) with reference to the second side.
  • a control circuit may be configured for dividing the position-detecting surface 250 into four regions I, II, III, and IV.
  • These four regions I, II, III, and IV may be based on whether each of the two light-receiving elements not receiving a light beam is a first light-receiving element 230a or a second light-receiving element 230b of one of the plurality of light-receiving element pairs (230a, 230b).
  • the angle ⁇ i will not be 45 degrees as disclosed in the exemplary embodiment of the Taiwan patent application No. 96151662.
  • the control circuit may be configured to compute via geometric analysis the X/Y rectangular coordinates (A, B) of the object M. Such computation may be carried out through the use of four equations, wherein the equation used in a given case depends on which of the four regions the object M is located.
  • the X/Y rectangular coordinates (A, B) may be computed via the following:
  • the object M is positioned within the region I of the position-detecting surface 250.
  • the equation to determine the X/Y rectangular coordinates (A, B) when the object M is positioned within the region I is the following:
  • the object M is positioned within the region II of the position-detecting surface 350.
  • the equation to determine the X/Y rectangular coordinates (A, B) when the object M is positioned within the region II is the following:
  • the object M is positioned within the region III of the position-detecting surface 250.
  • the equation to determine the X/Y rectangular coordinates (A, B) when the object M is positioned within the region III is the following:
  • the object M is positioned within the region IV of the position-detecting surface 250.
  • the equation to determine the X/Y rectangular coordinates (A, B) when the object M is positioned within the region IV is the following:
  • Fig.2A and Fig.2B are a schematic diagram of the construction of a multi-touch optical touch panel provided merely for two-point touch. If a user simultaneously touches two points on the position- detecting surface 250 as shown in Fig. 2A, the two points will block four light beams. In such case, there will be six potential points being obtained via the computation of the equations mentioned above based on the blocked light beam.
  • the actual coordinates of (n-1) objects that simultaneously touch (n- 1) points can be determined if each point on the position-detecting surface has (n) light beams passing through during a scan cycle. Accordingly, the construction of a multi-touch optical touch panel provided for detecting four-point touch can be made by further adding other light-emitting elements and corresponding light- receiving elements on the position-detecting surface 250 as shown in Fig. 2A and Fig. 2B, in order to obtain six potential points via the computation of the equations mentioned above based on the blocked light beam for extracting the actual touch points and determine the actual coordinates of objects or touches when requiring four-point touch.
  • Fig. 1 the construction of a multi-touch optical touch panel provided for detecting four-point touch can be made by further adding other light-emitting elements and corresponding light- receiving elements on the position-detecting surface 250 as shown in Fig. 2A and Fig. 2B, in order to obtain six potential points via the computation of the equations mentioned above based on the blocked light beam for extracting the actual touch
  • FIG. 3 is a schematic diagram of arranging the added plurality of light-emitting element pairs (210c, 21Od) and the corresponding plurality of light- receiving element pairs (230c, 23Od) on the position- detecting surface 250 for the construction of a multi-touch optical touch panel provided for detecting four-point touch.
  • the details of how to arrange the plurality of light-emitting element pairs (210a, 210b, 210c, 21Od) and the plurality of light-emitting elements 21Oe, or the plurality of light-receiving element pairs (230a, 230b, 230c, 23Od) and the plurality light-receiving elements 23Oe will be described later with reference to Fig. 4 to Fig. 7.
  • Fig. 3 it shows other light-emitting elements and corresponding light-receiving elements with an angle ⁇ 2 other than the angle G 1 are added on the position-detecting surface 250 as shown in Fig. 2A and Fig.2B that are the construction of a multi-touch optical touch panel provided for detecting two-point touch.
  • the added plurality of light-emitting element pairs (210c, 21Od) may be arranged in pair at various points (e.g., point 0, point 1 ... point 14) along a first side respectively at an angle (I8O- ⁇ 2) and an angle ⁇ 2 with reference to the first side of the rectangular position- detecting surface 250 in a lengthwise (L) direction.
  • the corresponding plurality of light- receiving element pairs (230c, 23Od) may be arranged in pair at various points (e.g., point 0, point 1 ... point 14) along a second side opposite to the first side respectively at an angle ( ⁇ 2-I8O) and an angle (- ⁇ 2 ) with reference to the second side of the rectangular position- detecting surface 250 in a lengthwise (L) direction.
  • ⁇ 2-I8O angle
  • - ⁇ 2 angle with reference to the second side of the rectangular position- detecting surface 250 in a lengthwise (L) direction.
  • the construction of the multi-touch optical touch panel by integrating Fig. 2 A, Fig. 2B and Fig. 3 may used to identify four objects that simultaneously touch four points, and determine actual coordinates thereof.
  • Fig. 4, Fig. 5 and Fig. 6 respectively show an assembled perspective view of how to arrange the plurality of light-emitting element pairs (210a, 210b, 210c, 21Od) and the plurality of light-emitting elements 21Oe, or the plurality of light-receiving element pairs
  • Fig.4 is a top view of arranging the plurality of light-emitting element pairs (210a, 210b)
  • Fig. 5 is a bottom view of the plurality of light-emitting element pairs and the plurality of light-emitting elements (210c, 21Od, 21Oe)
  • Fig. 6 is a side view of the multi-touch optical touch panel. As shown in Fig.
  • the plurality of light- receiving element pairs (210a, 210b) and the plurality of light- receiving element pairs (210c, 21Od) may be respectively arranged on the top side and bottom side of the position-detecting surface 250.
  • the plurality of light-receiving element pairs, the plurality of light-emitting elements, the plurality of light-receiving element pairs and the plurality of light-receiving elements are affixed to a frame-shaped circuit board 310 that surrounds the perimeter of the position- detecting surface 250.
  • Fig. 7 is a flowchart of determining actual coordinates of objects or touches positioned on a position-detecting surface of a multi-touch optical touch panel provided for detecting four-point touch. The process starts in step 704, in which for angle ⁇ i, the panel detects all light-receiving elements that do not receive light beams during a scan cycle due to the blockage of the light beams by objects
  • the panel will obtain all potential combinations by selecting any two of all light-receiving elements that do not receive the light beams in order to determine all potential positions of objects, and separately compute touch coordinates of all potential positions of objects to create a set of the coordinates of objects (touches) based on the four equations for the four regions I, II, III and IV (step 706).
  • step 708 the distances and the set of the coordinates of objects (touches) will be stored. Thereafter, the process will repeat the previous steps for next ⁇ i(step 710).
  • a multi-touch optical touch panel can be broadened for detecting more than four-point touch by further adding other light- emitting elements and corresponding light-receiving elements on the position-detecting surface 250 as shown in Fig. 2A and Fig. 2B, in order to extract the actual touch points and determine the actual coordinates of objects or touches when requiring more than four-point touch.
PCT/EP2010/053938 2009-03-31 2010-03-25 Multi-touch optical touch panel WO2010112404A1 (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
US13/257,802 US8878818B2 (en) 2009-03-31 2010-03-25 Multi-touch optical touch panel
JP2012502589A JP5593375B2 (ja) 2009-03-31 2010-03-25 マルチタッチ光学タッチ・パネルのための装置および方法（マルチタッチ光学タッチ・パネル）
CN201080002790.7A CN102203707B (zh) 2009-03-31 2010-03-25 多触点光学触摸面板
CA2743108A CA2743108C (en) 2009-03-31 2010-03-25 Multi-touch optical touch panel
EP10711657.6A EP2414922B1 (en) 2009-03-31 2010-03-25 Multi-touch optical touch panel

Applications Claiming Priority (2)

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TW98110813 2009-03-31
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Cited By (27)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2014523029A (ja) * 2011-07-01 2014-09-08 ランドプラス カンパニーリミテッド マルチタッチ認識装置
US8878818B2 (en) 2009-03-31 2014-11-04 International Business Machines Corporation Multi-touch optical touch panel
JP2015511752A (ja) * 2012-03-26 2015-04-20 ランドプラス カンパニーリミテッド マルチタッチスクリーン装置
EP2990917A4 (en) * 2013-04-24 2016-11-30 Boe Technology Group Co Ltd INFRARED TOUCH MODULE, INFRARED TOUCH SCREEN AND DISPLAY APPARATUS
US9626040B2 (en) 2012-05-23 2017-04-18 Flatfrog Laboratories Ab Touch-sensitive apparatus with improved spatial resolution
US9678602B2 (en) 2012-05-23 2017-06-13 Flatfrog Laboratories Ab Touch-sensitive apparatus with improved spatial resolution
US9874978B2 (en) 2013-07-12 2018-01-23 Flatfrog Laboratories Ab Partial detect mode
US10019113B2 (en) 2013-04-11 2018-07-10 Flatfrog Laboratories Ab Tomographic processing for touch detection
US10126882B2 (en) 2014-01-16 2018-11-13 Flatfrog Laboratories Ab TIR-based optical touch systems of projection-type
US10146376B2 (en) 2014-01-16 2018-12-04 Flatfrog Laboratories Ab Light coupling in TIR-based optical touch systems
US10161886B2 (en) 2014-06-27 2018-12-25 Flatfrog Laboratories Ab Detection of surface contamination
US10168835B2 (en) 2012-05-23 2019-01-01 Flatfrog Laboratories Ab Spatial resolution in touch displays
US10282035B2 (en) 2016-12-07 2019-05-07 Flatfrog Laboratories Ab Touch device
US10318074B2 (en) 2015-01-30 2019-06-11 Flatfrog Laboratories Ab Touch-sensing OLED display with tilted emitters
US10401546B2 (en) 2015-03-02 2019-09-03 Flatfrog Laboratories Ab Optical component for light coupling
US10437389B2 (en) 2017-03-28 2019-10-08 Flatfrog Laboratories Ab Touch sensing apparatus and method for assembly
US10474249B2 (en) 2008-12-05 2019-11-12 Flatfrog Laboratories Ab Touch sensing apparatus and method of operating the same
US10481737B2 (en) 2017-03-22 2019-11-19 Flatfrog Laboratories Ab Pen differentiation for touch display
US10496227B2 (en) 2015-02-09 2019-12-03 Flatfrog Laboratories Ab Optical touch system comprising means for projecting and detecting light beams above and inside a transmissive panel
US10761657B2 (en) 2016-11-24 2020-09-01 Flatfrog Laboratories Ab Automatic optimisation of touch signal
US11182023B2 (en) 2015-01-28 2021-11-23 Flatfrog Laboratories Ab Dynamic touch quarantine frames
US11256371B2 (en) 2017-09-01 2022-02-22 Flatfrog Laboratories Ab Optical component
US11301089B2 (en) 2015-12-09 2022-04-12 Flatfrog Laboratories Ab Stylus identification
US11474644B2 (en) 2017-02-06 2022-10-18 Flatfrog Laboratories Ab Optical coupling in touch-sensing systems
US11567610B2 (en) 2018-03-05 2023-01-31 Flatfrog Laboratories Ab Detection line broadening
US11893189B2 (en) 2020-02-10 2024-02-06 Flatfrog Laboratories Ab Touch-sensing apparatus
US11943563B2 (en) 2019-01-25 2024-03-26 FlatFrog Laboratories, AB Videoconferencing terminal and method of operating the same

Families Citing this family (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9213443B2 (en) 2009-02-15 2015-12-15 Neonode Inc. Optical touch screen systems using reflected light
US20100238139A1 (en) * 2009-02-15 2010-09-23 Neonode Inc. Optical touch screen systems using wide light beams
US9092092B2 (en) 2008-08-07 2015-07-28 Rapt Ip Limited Detecting multitouch events in an optical touch-sensitive device using touch event templates
CN111443832A (zh) * 2012-04-30 2020-07-24 拉普特知识产权公司 光学触敏装置中用触摸事件模板检测多触摸事件
KR101978239B1 (ko) 2012-06-22 2019-05-14 삼성전자주식회사 컨텐츠를 편집하는 방법 및 그 전자 장치
CN102945100A (zh) * 2012-06-29 2013-02-27 北京汇冠新技术股份有限公司 红外触摸屏
TWI493413B (zh) * 2012-08-23 2015-07-21 原相科技股份有限公司 光學觸控系統及其操作方法
CN103472958B (zh) * 2013-08-27 2016-08-10 合肥工业大学 一种基于红外多点触摸计算坐标的方法
BR102014006114B1 (pt) * 2014-03-14 2022-05-10 Antônio Francisco Neves Filho Stent com válvula cardíaca mecânica ou biológica para procedimento de troca de válvula minimamente invasivo e dispositivo aplicador de stent
CN107102758B (zh) * 2016-10-13 2020-04-10 安沛科技股份有限公司 触控面板的扫描方法及补偿方法
CN108415655B (zh) * 2018-02-08 2020-10-23 广州华欣电子科技有限公司 触摸数据处理的方法、装置、一体机及存储介质
CN111554037B (zh) * 2019-02-11 2022-02-01 山东新北洋信息技术股份有限公司 自动售货机
US20230400948A1 (en) * 2020-11-17 2023-12-14 Flatfrog Laboratories Ab Improved touch-sensing apparatus

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6597508B2 (en) 1999-04-28 2003-07-22 Japan Aviation Electronics Industry, Limited Optical touch panel having reduced number of elements
US20030156332A1 (en) * 2001-02-28 2003-08-21 Japan Aviation Electronics Industry, Limited Optical touch panel
WO2006095320A2 (en) * 2005-03-10 2006-09-14 Koninklijke Philips Electronics, N.V. System and method for detecting the location, size and shape of multiple objects that interact with a touch screen display
US20080266266A1 (en) * 2007-04-25 2008-10-30 Tyco Electronics Corporation Touchscreen for detecting multiple touches
US20080304084A1 (en) * 2006-09-29 2008-12-11 Kil-Sun Kim Multi Position Detecting Method and Area Detecting Method in Infrared Rays Type Touch Screen
WO2008154792A1 (fr) * 2007-06-15 2008-12-24 Vtron Technologies Ltd. Ecran tactile infrarouge et procédé de positionnement tactile multipoint
US20090066662A1 (en) * 2007-09-07 2009-03-12 Quanta Computer Inc. Method and system for distinguishing multiple touch points
US20090167724A1 (en) 2007-12-28 2009-07-02 International Business Machines Corporation Optical Touch Panel

Family Cites Families (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61213919A (ja) * 1985-03-19 1986-09-22 Arupain Kk 光学式タツチパネルにおける位置検出方法
JPH01195526A (ja) 1988-01-29 1989-08-07 Sony Corp タッチパネル装置
JPH01314324A (ja) * 1988-06-14 1989-12-19 Sony Corp タッチパネル装置
US5162783A (en) 1990-07-23 1992-11-10 Akzo N.V. Infrared touch screen device for a video monitor
JPH04209428A (ja) 1990-11-30 1992-07-30 Mazda Motor Corp タッチスイッチ装置
US6690363B2 (en) 2000-06-19 2004-02-10 Next Holdings Limited Touch panel display system
WO2009008786A1 (en) * 2007-07-06 2009-01-15 Neonode Inc. Scanning of a touch screen
US8339379B2 (en) * 2004-04-29 2012-12-25 Neonode Inc. Light-based touch screen
US6961051B2 (en) 2003-01-29 2005-11-01 Visteon Global Technologies, Inc. Cross-point matrix for infrared touchscreen
US20050248548A1 (en) * 2004-04-14 2005-11-10 Masahiro Tsumura Acoustic touch sensor
CN101479691B (zh) * 2006-06-28 2011-12-14 皇家飞利浦电子股份有限公司 基于光学参数的用于对象学习和识别的方法及装置
CN100527066C (zh) 2007-06-15 2009-08-12 广东威创视讯科技股份有限公司 一种红外线触摸屏及其多点触摸定位方法
CN100485595C (zh) 2007-07-25 2009-05-06 广东威创视讯科技股份有限公司 一种触摸屏装置与多点触摸定位方法
KR101009278B1 (ko) * 2008-10-02 2011-01-18 한국과학기술연구원 광 인식 사용자 입력 장치 및 사용자 입력 인식 방법
US8294691B2 (en) * 2008-11-14 2012-10-23 Motorola Mobility Llc Waveguard touch panel
TWI524238B (zh) 2009-03-31 2016-03-01 萬國商業機器公司 多觸點光學接觸面板

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6597508B2 (en) 1999-04-28 2003-07-22 Japan Aviation Electronics Industry, Limited Optical touch panel having reduced number of elements
US20030156332A1 (en) * 2001-02-28 2003-08-21 Japan Aviation Electronics Industry, Limited Optical touch panel
WO2006095320A2 (en) * 2005-03-10 2006-09-14 Koninklijke Philips Electronics, N.V. System and method for detecting the location, size and shape of multiple objects that interact with a touch screen display
US20080304084A1 (en) * 2006-09-29 2008-12-11 Kil-Sun Kim Multi Position Detecting Method and Area Detecting Method in Infrared Rays Type Touch Screen
US20080266266A1 (en) * 2007-04-25 2008-10-30 Tyco Electronics Corporation Touchscreen for detecting multiple touches
WO2008154792A1 (fr) * 2007-06-15 2008-12-24 Vtron Technologies Ltd. Ecran tactile infrarouge et procédé de positionnement tactile multipoint
US20090066662A1 (en) * 2007-09-07 2009-03-12 Quanta Computer Inc. Method and system for distinguishing multiple touch points
US20090167724A1 (en) 2007-12-28 2009-07-02 International Business Machines Corporation Optical Touch Panel

Cited By (42)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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US8878818B2 (en) 2009-03-31 2014-11-04 International Business Machines Corporation Multi-touch optical touch panel
JP2014523029A (ja) * 2011-07-01 2014-09-08 ランドプラス カンパニーリミテッド マルチタッチ認識装置
JP2015511752A (ja) * 2012-03-26 2015-04-20 ランドプラス カンパニーリミテッド マルチタッチスクリーン装置
US10168835B2 (en) 2012-05-23 2019-01-01 Flatfrog Laboratories Ab Spatial resolution in touch displays
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US10019113B2 (en) 2013-04-11 2018-07-10 Flatfrog Laboratories Ab Tomographic processing for touch detection
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US9874978B2 (en) 2013-07-12 2018-01-23 Flatfrog Laboratories Ab Partial detect mode
US10146376B2 (en) 2014-01-16 2018-12-04 Flatfrog Laboratories Ab Light coupling in TIR-based optical touch systems
US10126882B2 (en) 2014-01-16 2018-11-13 Flatfrog Laboratories Ab TIR-based optical touch systems of projection-type
US10161886B2 (en) 2014-06-27 2018-12-25 Flatfrog Laboratories Ab Detection of surface contamination
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US10318074B2 (en) 2015-01-30 2019-06-11 Flatfrog Laboratories Ab Touch-sensing OLED display with tilted emitters
US10496227B2 (en) 2015-02-09 2019-12-03 Flatfrog Laboratories Ab Optical touch system comprising means for projecting and detecting light beams above and inside a transmissive panel
US11029783B2 (en) 2015-02-09 2021-06-08 Flatfrog Laboratories Ab Optical touch system comprising means for projecting and detecting light beams above and inside a transmissive panel
US10401546B2 (en) 2015-03-02 2019-09-03 Flatfrog Laboratories Ab Optical component for light coupling
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US10761657B2 (en) 2016-11-24 2020-09-01 Flatfrog Laboratories Ab Automatic optimisation of touch signal
US11579731B2 (en) 2016-12-07 2023-02-14 Flatfrog Laboratories Ab Touch device
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US11740741B2 (en) 2017-02-06 2023-08-29 Flatfrog Laboratories Ab Optical coupling in touch-sensing systems
US11474644B2 (en) 2017-02-06 2022-10-18 Flatfrog Laboratories Ab Optical coupling in touch-sensing systems
US10606414B2 (en) 2017-03-22 2020-03-31 Flatfrog Laboratories Ab Eraser for touch displays
US11099688B2 (en) 2017-03-22 2021-08-24 Flatfrog Laboratories Ab Eraser for touch displays
US11016605B2 (en) 2017-03-22 2021-05-25 Flatfrog Laboratories Ab Pen differentiation for touch displays
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US11893189B2 (en) 2020-02-10 2024-02-06 Flatfrog Laboratories Ab Touch-sensing apparatus

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EP2414922A1 (en) 2012-02-08
CA2743108A1 (en) 2010-10-07
KR20120027174A (ko) 2012-03-21
CN102203707A (zh) 2011-09-28
US20120007835A1 (en) 2012-01-12
US8878818B2 (en) 2014-11-04
TWI524238B (zh) 2016-03-01
EP2414922B1 (en) 2016-11-23
TW201035834A (en) 2010-10-01
JP2012522298A (ja) 2012-09-20
JP5593375B2 (ja) 2014-09-24
CA2743108C (en) 2017-09-19
CN102203707B (zh) 2015-04-15

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